The first evidence for string theory?

 作者:鄂藏     |      日期:2019-03-15 01:19:04
By Marcus Chown IF YOU consider them separately, these two observations are hardly going to set the scientific world on fire. But together they add up to a spectacular possibility. In a tiny region of sky, astronomers have seen a dozen galaxies that appear as a curious sequence of double images. They have also observed a quasar whose brightness oscillates in an unexpected way. What could cause these odd phenomena? The only explanation that covers both is pretty mind-bending: “superstrings” of pure energy that can stretch millions of light years across the universe. Is this the first experimental evidence for string theory? The theory is our best hope of understanding how the universe works at its most fundamental level. It suggests that the basic constituents of matter are impossibly narrow threads of concentrated energy. The various different ways these superstrings can vibrate correspond to different fundamental particles, such as the up-quark and the muon-neutrino. The idea is well on the way to becoming a “theory of everything”, uniting the laws of physics to explain how all matter and energy behave. One of the strangest features of string theory is that it requires many more dimensions than we can see: the only way the vibration modes of the superstrings can be sufficiently diverse to create all particles is if the superstrings vibrate in a space-time of 10 dimensions. Of course,